The announcement was published this morning on their website and Twitter account, as it looks like the BlackArch developers plan to remove the 32-bit ISO images and respective repositories soon, urging all those running BlackArch on 32-bit PCs to upgrade to the 64-bit version of the operating system as soon as possible. Beginning November 30, 2017, the BlackArch Linux operating system will be available only for 64-bit machines. The 32-bit ISO images have been already removed from the official website, and if you’re still using a 32-bit BlackArch system you won’t be able to update your apps to newer versions, nor patch security issues.